BIOLOGY 171 Midterm: Biology 171 Fall 2016 Unit 2 Exam Review

• School: U of M
• Department: Biology
• Course: BIOLOGY 171
• Professor: Josephine Kurdziel

Document Summary

Lecture 7: describe how gene x environment interactions change the relationship between genotypes and phenotypes. Ge(cid:374)e (cid:454) e(cid:374)(cid:448)iro(cid:374)(cid:373)e(cid:374)t i(cid:374)tera(cid:272)tio(cid:374)s sa(cid:455) that a(cid:374) orga(cid:374)is(cid:373)s" phe(cid:374)ot(cid:455)pe is depe(cid:374)de(cid:374)t (cid:271)oth on genetics and the environment in which it is in. Noticing how organisms with different genotypes react in an environment: describe how epistasis (gene x gene interaction) changes the relationship between genotypes and phenotypes. Epistasis is when multiple genes control one trait/phenotype. Also can be said that one gene masks the effects of the other genes. For example, if you have the version of the gene that codes for baldness, you will be bald and it does not matter what color the other genes code for: compare and contrast sex chromosomes and autosomes. Autoso(cid:373)es (cid:373)ake up the (cid:373)ajorit(cid:455) of a(cid:374) orga(cid:374)is(cid:373)s" (cid:272)hro(cid:373)oso(cid:373)es a(cid:374)d ea(cid:272)h orga(cid:374)is(cid:373)s typically have 2 sex chromosomes. In humans, the sex chromosomes are x and y. The human diploid number is 2n=46 and n=23.